Cerebral microvascular amyloid-beta (Abeta) protein deposition is emerging as an important contributory factor to neuroinflammation and dementia in Alzheimer's disease and related familial cerebral amyloid angiopathy disorders.
A mutation at codon 693 of APP has also been described as the genetic defect in hereditary cerebral hemorrhage with amyloidosis of the Dutch type (HCHWA-D).
Mutations within the beta-amyloid precursor protein (beta-APP) gene that cosegregate with early onset familial Alzheimer's disease (FAD) and hereditary cerebral hemorrhage with amyloidosis of the Dutch-type (HCHWA-D) have been reported.
The data indicate that the APP gene is tightly linked to HCHWA-D and therefore, in contrast to familial Alzheimer's disease, cannot be excluded as the site of mutation in HCHWA-D.